A Dot On Soroban

A dot on the beam is for your reference to mark the selected bar as ones location from the number system. With this fixing of the bar, all other bars to the left of the selected bar start representaing a place in the number system. In the physical soroban devices, there is a provision of a dot on every third bar and its upto you to select a bar for yourself, as per your convenience. However, for our smart soroban (online device), we will always mark the rightmost bar as the ones bar with a dot.